"Why are so many people allowed to listen to your phone calls anyway?" Rivera asked.

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"Well, that’s what they’ve done over the years," Trump said. "When you call a foreign leader, people listen. I may end the practice entirely. I may end it entirely."

Top White House and national security officials typically listen in on presidential phone calls to keep everyone on the same page and create a record of the conversation.

Trump's call with Ukrainian President Volodymyr Zelensky set off the impeachment inquiry after a whistleblower raised concerns that the president was pressuring Zelensky to investigate his political rivals while holding up hundreds of millions of dollars in military aid to Ukraine.

The president has repeatedly said he was aware other officials were listening to that conversation, which he has maintained was "perfect,” repeatedly telling people to “read the transcript.”

The House impeached Trump in December for abuse of power and obstruction of Congress, and the Senate acquitted him last week.

Vindman, a Purple Heart recipient detailed to the National Security Council at the time, reported to his superior that he was concerned about the political nature of Trump's call.